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Suggest you 'search' this issue.
1. The lifters were revised and an update part # given. Nobody knows what the change was.
2. The lifters that do not 'spring back' - are they jammed ? The tappet is in two mating pieces with a spring inside and a little circular retainer. So you mean the two halves of the tappet are jammed together?
I chased this issue hard recently .The tapping was not the full extent of the problem. A rod bearing was beginning to fail.A feint lifter (or so I thought) noise that over a few days got louder.BTW several of my lifters were jammed also.
Cut open you oil filter,drop the pan ,check your mag drain plug ,fit an LN Filter .
I am experimenting with BMW lifters because they were a fraction of the price.More if you search.
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